Abstract: A DC/DC converter which may be used as a power supply of high capacity. The DC/DC converter comprises first and second converters having their primary terminals connected in series so as to insure high output power and high breakdwon voltage; a first diode for forming a closed circuit together with a transformer of the first converter and a capacitor of the second converter when a switching element of the first converter is turned "off"; and a second diode for forming a closed circuit together with a transformer of the second converter and a capacitor of the first converter when a switching element of the second converter is turned "off".

Abstract: An object which can provide a reference for measuring the intensity of a primary magnetic field, is positioned in the vicinity of a subject being examined. A variation in the primary magnetic field intensity is detected, based on a frequency shift of data observed of the object, and is used to control the primary magnetic field intensity, or reference frequency for phase detection, or to correct image data. In this manner image quality is prevented from being degraded due to the variation of the primary magnetic field intensity.

Abstract: A capacitive displacement type transducer, wherein the oscillation frequency of a self-excited oscillator circuit including a pair of differential capacitors formed with a movable electrode disposed between two outer electrodes is counted by a counter, the output level of the counter is reversed each time a certain count is attained to cause the differential capacitances to be switched alternatively, and to make identical the respective reversal periods, and application voltage to be applied to the differential capacitors being controlled by an integrator, and a voltage relating to the output of the integrator being applied through a fixed impedance to the movable electrode, thereby eliminating fixed capacitances formed across the difference capacitors. Also, a voltage generated by dividing and averaging the output level of the counter by use of a certain pulse duration of a monostable circuit operating in synchronism with a counter, is used to compensate for static pressure changes.

Abstract: In an electromagnetic flow meter converter comprising a deviation amplifier for amplifying the deviation between a feedback signal and an input signal from a flow rate detector, and a converter circuit for converting the amplified output of the deviation amplifier into a frequency signal, the improvement comprising a frequency divider for frequency dividing the frequency signal, a digital setting unit for setting the frequency dividing factor of the frequency divider, and a multiplier for multiplying the output of the frequency divider by a comparison voltage which is proportional to the current applied to the coil of the flow rate detector to provide the feedback signal, whereby the span is set digitally and whereby the compatibility between the converter and the flow rate detector is obtained by setting the product of the meter constant of the flow rate detector and a predetermined maximum flow velocity.

Abstract: A pressure measuring apparatus comprising a diaphragm to which pressure to be measured is applied and a resilient vibrator connected to the diaphragm, which acts to produce a signal based on its natural frequency relative to the pressure, wherein the diaphragm comprises a peripheral circumferential portion, a central fixing portion and a non-planar intermediate portion therebetween, with the central portion being connected to the vibrator and having its edge disposed at a non-perpendicular angle with respect to the vibrator area to which it is connected. The apparatus eliminates adverse influences due to initial distortion, hysteresis of the diaphragm and produces accurate measurements.

Abstract: A displacement transducer comprising a code disk on which a plurality of light permeable slits arranged with a fixed pitch are formed, a light source which emits light to the code disk, and an image sensor which receives the light from the light source through the light permeable slits. High resolution and fast response performance are realized by measuring a displacement of the code disk from the amount of the phase shift of a fundamental wave component contained in the output obtained from the image sensor. There is a further advantage of suppressing zero point return operation to a minimum as well as improving linearity of an image sensor.

Abstract: A DC/DC converter for producing a plurality of output voltages, comprising a transformer having a primary coil and a plurality of secondary coils; a switching circuit adapted to turn ON and OFF the supply of input DC voltage to the primary coil; rectifying and smoothing circuits for rectifying and smoothing the AC voltages obtained in the secondary coils; a circuit means connected in series with the rectifying and smoothing circuits to obtain the sum of the output voltages from the respective rectifying and smoothing circuits; and a control circuit adapted to receive the lowest DC output voltage from the rectifying and smoothing circuits and to control the ON - OFF operation of the switching circuit so that the lowest voltage is maintained at a constant level, and wherein the DC voltages from the respective rectifying and smoothing circuits are obtained by making use of one of the output terminals of the lowest DC voltage as a common terminal.

Abstract: In an apparatus for conducting solubilization chromatography wherein a solvent consisting of a buffer and ionized micells is allowed to flow through a capillary tube whose both ends are connected to the plus and minus sides, respectively, of a DC source, then a sample is introduced into the capillary tube, components of the sample are separated by combination of dissolution phenomenon of the sample in the ionized micells and capillary electro-phoresis, and qualitative and quantitative analysis of the components is carried out; a three way joint is provided having a first opening connected to the capillary tube, a second opening connected to tubing for feeding the solvent and sample, and a third opening serving as a discharge outlet for residue solution of solvent and sample not introduced into the capillary tube; and means are provided for controlling the time the sample contacts an inlet of the capillary tube within the three way joint, whereby the quantity of sample introduced into the capillary tube is con

Abstract: A microwave moisture sensor operates on the principle that an emitted microwave is attenuated in rotary resonance with water molecules. The microwave moisture sensor includes measurement and reference signal systems sharing a microwave oscillator, a detector and other components, means for calculating the ratio of the signals from the respective systems, and an AGC circuit means for keeping the reference signal from the reference signal system at a predetermined level, so that drifts of the microwave oscillator, detector and other components will be cancelled and thus increased measuring accuracy will result. Furthermore, the microwave moisture sensor measure the basis weight and temperature of a material being measured, and processes the measured values according to predetermined moisture percentages free from adverse influences of the basis weight and temperature and thus increase the degree of measurement accuracy.

Abstract: An NMR imaging apparatus which generates NMR signals cleared of foreign noises by adding a noise detecting coil, for detecting mainly the foreign noises, to an intrinsic detecting coil for detecting the NMR signals and by producing a difference from the outputs of the two detecting coils. As a result, the foreign noises can be eliminated simply and effectively without requiring expensive shielded rooms.

Abstract: An electromagnetic flowmeter using an exciting current of a rectangular wave form supplied to an exciting coil for excitation, wherein a DC voltage produced by rectifying a frequency power source, is applied by way of a voltage regulating circuit to an exciting circuit, and a switching device is connected in series between the exciting circuit and the voltage regulating circuit and is controlled by a DC reference voltage determining the level of the exciting voltage and a timing signal determining the switching timing for the exciting current. The invention enables accurate and rapid control of the waveform of the exciting current, reduces costs, and can be used for different voltages without any substantial change of circuitry.

Abstract: The static magnetic fields of an NMR imaging apparatus should be maintained constant in intensity in order to obtain satisfactory NMR images. Coils used to generate the static magnetic fields, and the supporting frames therefor, are subject to heat expansion due to changes in the temperature, which causes fluctuations in the intensity of the generated static magnetic fields. In the invention, the temperatures of the coils, frames, atmosphere and cooling water, and the amount of cooling water, are detected, and the energizing current for the static magnetic field coils is selectively controlled, based on the detected quantities, to thereby maintain constant the intensity of the generated static magnetic fields.

Abstract: An NMR data processing method for use with an NMR tomograph, wherein signals, located in a period before and after an NMR signal to be sampled and containing substantially none of the NMR signal component, are measured as offset data for each view, so that even the offset slightly fluctuating in the view can be corrected for the NMR signal, on the basis of that data.

Abstract: A multi-colored recording apparatus comprising a carriage disposed to be movable in the width direction and having a single wire hammer, a ribbon cassette having a plurality of different colored ribbons extending an effective width of the recording sheet, a driving mechanism for causing the ribbon cassette to rotate and bring one colored ribbon in position between the hammer and recording sheet for effecting recording and move the cassette away from the recording sheet after recording, wherein the recorded data is advantageously readily read without interference of the cassette with the reading, and display for displaying a bar graph for the analog signals as represented by the different colored ribbons, wherein the use of only a single hammer with the movable cassette containing the different colored ribbons extending the effective width of the recording sheet provides a compact and light apparatus.

Abstract: In conventional subminiature current transformers, voltage withstandability property is not reliable and frequency characteristics are inferior. The current transformer of the invention, advantageously, is able to withstand high voltages and also has other advantageous characteristics. A primary coil and a secondary coil are wound about individual bobbins disposed on two L-shaped legs connected together to form a square "O" shaped core. Compensation for various errors is accomplished by a condenser and a resistor connected between the input and output terminals of an operational amplifier (of the integrated circuit type) which is connected to the output of the secondary coil. The primary and secondary core areas are selectively controlled as to the currents applied to enable the transformer to withstand the high voltages.

Abstract: A thermal head comprising a plurality of electrode layers laminated in succession on one side of a substrate with a glass layer therebetween which serves as an electrical insulating and heat resistant layer, and a heating resistive element formed on the end surface formed by cutting an end portion of the substrate having the various layers thereon. The end surface may be subjected to skewed grinding. A method of manufacturing the thermal head is also disclosed. The thermal head is used in various types of printing machines and recorders.

Abstract: An electromagnetic flow meter comprising an electromagnetic flow signal generator having a pipe through which a fluid to be measured flows, an exciting coil and a pair of electrodes, an exciting circuit for supplying an exciting current whose normal value is switched at a low frequency to the exciting coil of the generator, and a signal processing circuit for effecting an arithmetic operation and outputting a flow rate signal concerning the flow rate of the fluid based on voltages induced between the electrodes of the generator; wherein to keep constant the exciting current, the exciting circuit comprises a switching regulator for stabilizing a power supply voltage and producing an exciting DC voltage dependent on a voltage setting, a switching circuit connected between the exciting coil and the switching regulator and applying the exciting voltage, while turning ON and OFF at a low frequency, to the exciting coil and an exciting current detection means connected in series between the switching regulator and

Abstract: In an examination method and apparatus utilizing nuclear magnetic resonance, high frequency pulses for producing nuclear magnetic resonance are applied by successively imposing a first 90.degree. pulse, a first 180.degree. pulse, a second 90.degree. pulse, and a second 180.degree. pulse substantially immediately after the second 90.degree. pulse, and a next pulse sequence is initiated upon elapse of a wait time after the second 180.degree. pulse has been applied. The wait time is rendered much shorter than the conventional prior art wait times for high speed scanning operation, by forcibly aligning magnetization M first with the direction of a -Z direction axis and then with the direction of a +Z direction axis, using the second 90.degree. pulse and the second 180.degree. pulse. By applying a number of first 180.degree. pulses, a number of nuclear magentic resonance signals are produced for additionally shortening the overall measurement time.

Abstract: An automatically balancing type pen recorder, which is compact in size and is highly reliable in operation, comprises an integral servo unit formed of a single printed circuit board which incorporates therein a pen carriage and an automatic balancing mechanism adapted to move a recording chart in a direction perpendicular to the direction of feed of the chart, in response to the magnitude of a measuring signal.

Abstract: A capacitive type converter device, such as used for measuring pressure, comprising first and second rectifying circuits, each including an operational amplifier with a non-inverting input terminal connected to a reference point, to which a variable condenser is connected, the variable condenser having a capacitance which varies in response to a force being measured, such as pressure, and to which a reference condenser is connected, the reference condenser having a capacitance which is fixed independent of the force being measured.